ML19340E705
| ML19340E705 | |
| Person / Time | |
|---|---|
| Issue date: | 12/12/1980 |
| From: | Bosnak R Office of Nuclear Reactor Regulation |
| To: | Silver R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19340E702 | List: |
| References | |
| TASK-OS, TASK-SC-922-5 NUDOCS 8101150465 | |
| Download: ML19340E705 (14) | |
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DEC 1 21980 MEMORANDU'4 FOR:
R. Silver Research & Standards Coordination Branch, DST FROM:
R. Bosnak, Chief Mechanical Engineering Branch, DE
SUBJECT:
STANDAR05 REVIEW REQUEST
Reference:
Memo from R. Bosnak to W. F. Anderson, " Standards Review Request - ANSI /AS'sE N45 ::551.2, Functional Qualification of Pumps for Active Safety Related Pump Assemblies for Nuclear Power Plants", dated May 30, 1978 The S'echanical Engineering Branch (f'ES), DE has reviewed the drafts of the folicwing proposed standards:
1.
ANSI M45 - N551-2, " Standard for Qualification of ASME Code Class 2 and 3 Pumps for Safety System Service", dated September, 1980.
2.
ANSI N45 - N551-5, "0ualification for Turbine Drives", dated September, 1980.
The MEB reviewed the January, 1978 draft of ANSI N45 - N551-2.and submitted coments to the Divisicn of Engineering Standards via the above referenced memorandum. A few of our coments were incorporated into the Septem::er,1980 draft.
In order to get this long awaited standard into use, we reco mend that it be approved. However, most of the general coments in the reference still apply. If the objective of this standard is to provide a document which an applicant can reference in a Safety Analysis Report as its complete program to demonstrate operability of active class 2 and 3 pumps, it will not be com-pletely acceptable for the following general reasons:
1.
To be acceptable as an FSAR reference, the proposed ANSI N45 - N551-2 must be consistent with the applicable criteria in Standard Review Plan 3.9.3 and Regulatory Guide 1.100.
2.
In Section 7.2.1 of the proposed ANSI 345 - N551-2, the Design Specification is referenced for loadings and loading combinations. Since the Design Specification is not normally included as a part of the routine review of an apolication for an Operating License, the required loadings and loading
. combinations should be contained in with ANSI M45 - N551.-l or N551-2.
If this information does not appear in either of these documents, we will centinue to require loadings and loading combinations for ASME class 2 and I
3 pumps to be specified in the FSAR's to assure both structural' integrity and operability.
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3.
A more detailed reivew.of the criteria for prototypes and verification is required. Our objective is to be as consistent as possbile between the subject standard and ASNI N278.2.4, "American National Standard for functional Qualification and Requirements of Power Operated / Safety Related Active Valve Assemblies for Nuclear Power Plants".
R. J. Bosnak, Chief Mechanical Engineering Sranch Division of Engineering cc:
R. Vollmer J. Knight F. Cherny C. Hofmayer L. Porse H. Brammer
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F Q4B COMMENTS ON ANSI N45-N551-2 i
1.
- p. B-1, 8 lines from bottom l
"quali fication" seismic qualification"
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P. B-4, Are cross-ccupling ratics #xy, etc. frequency dependent?
If yes, will the peak values be used in the equation for seismic coefficients?
3.
P. B-6, Section B.4.1, a. S tatic Analysis "or higher than 33 Hz" l
or higher than 33 Hz for seismic loadings, and other i
specific rigid frequencies for hydrodynamic load cases,"
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EQS b.
Thermal expansion compared co adjacent parts both for stress
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and operability.
c.
Stress level, deflection and fatigue life.
d.
Resistance to galling and tearing in relation to adjacent materials where relative motion is present.
Stability when subjected to all design conditions, including e.
radiation, thermal cycles, mechanical and pressu:e load cycles, and environmental conditions, f.
Suitability for use with the mar.ufacturing processes intended.
g.
Suitability for weld repair during manufacture while retaining the required corrosion resistant properties.
h.
Stability during manufacturing for parts required to maintain close tolerances on straightness and concentricity for operability.
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,;fQy -Q ahihd uM 5.3 Materia'l Examination and Reoair 5.3.1 All wrought materials and finish machined castings shall be examined visually for defects. The acceptance criteria for this examination is as follows:
Linear defects shall not be acceptable if the length exceeds the values defined in NC/ND 2500 of the ASME B&PV Code Section III, Division 1.
5.S.2 For materials not covered by the ASME B&PV Code Section III, Division 1, or Code Case N-119 nonlinear defects shall be acceptable provided the following requirements are met:
a.
The limit of the defect can be seen or found by excavation.
b.
Interchangeability with other parts is not affected.
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o b.
For materials which have greater galling tendencies, such as the 300 series stainless steels, 0.005 inch minimum shall be added to the diametral clearances shown above.
c.
For materials which have less galling tendencies, such as steel with a minimum hardness of 45 Rockwell "C" (430 Brinell), 0.004 inch may be subtracted from the diametral clearances shown above.
6.3.3 Shaft a.
The shaft shall be sized to transmit the maximum torque at any given location, b.
The shaft shall be designed to limit reduction of fatigue strength due to stress concentration at corners in keyway slots, abrup:
changes in shaft diameter or notches.
6.3.4 Shaft Sleeves Shaft sleeves shall be used at the stuffing box where the shaft is subject to wearA w r3 r-vT t o c. A r i o ~ 5 w d5:11
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The sleeves shall be locked to the shaft in a positive manner, and shall be designed to be removable and replaceable in the field.
b.
The shaft sleeves for packing shall be of a wear, corrosion, and erosion resistant material.
c.
The outside surface finish or the wear surface of the shaft packing sleeve shall not exceed 63 R.M.S. when packing is used.
6.3.5 Imceller Retention If a nut is used on the pump shaft to retain the impeller, this nut shall be prevented from loosening by a positive locking device.
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6.4 piping Joints - Auxiliary Systems no 7~
6.4.1 Threads for valves, fittings and auxiliary connections shall'be taper pipe threads in conformance with the specifications of ANSI 82.1.
6.4Property "ANSI code" (as page type) with input value "ANSI 82.1.</br></br>6.4" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process..2 Tapped openings and bosses for pipe threads shall conform to ANSI B16.5.
6.4Property "ANSI code" (as page type) with input value "ANSI B16.5.</br></br>6.4" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process..3 Only ground-joint type unions may be used.
6.4.4 Unions shall not be used as follows:
a.
In any piping that cannot be isolated from the process fluid; b.
Where it is practicable to provide the required disassembly capability by use of flanges.
6.5 Fabrication 6.5.1 Welding - Nonoressure Boundary Parts Pump internals essential for pump reliability and/or functionability shall meet the following requirements:
a.
The welding procedures and the welders shall be qualified in l
accordance with ASME Code,Section IX.
b.
Welds that are visually inspected shall be designed with an allowable joint efficiency of 70 percent of the allowable stress.
I c.
Non-destructive examination shall be applied as specified.
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6.5.2 Balancing l
Major rotating parts such as impellers, couplings and balancing drums shall be dynamically balanced. Pf tne pump i s
'.w be specst.d at any vi LMe' following cenditt:nn -
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.o a.Tspeeds over 1,700 rpm, if rateTrapacity exceeds 250 gpm and rotating-part-diameto, is more T.han-6-tncheC b.- At speeds over 1,700 rpm for two or more itages;
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At-spee65 bver 3,500~ifm'.
6.5.3 Vibration The pump shall be designed, fabricated, and tested to prevent excessive "Mbrat]
brg io g asu s shg l bg ta g thg housing.oit Meas;urements"shallbetakenatratedspeedandwithirfplusorminustenpercent of rated capacity. Measurements shall not exceed the following limits:
Soeed (rom)
Double Amolitude Vibration, Max. (mils) 1200 and below 4.0 1201 to 1800 3.0 1J01 to 4500 2.5 4501 to 6000
- 2. 0 Over 6000
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6.6 Oriver Sizing i
The driver efficiency and horsepower shall be such that nameplate rating (without service factor) is not exceeded anywhere on the pump performance curve frem minimum to runout flow.
l 6.7 Documentation l
The manufacturer shall establish procedures to provide the data package in accordance with Section 11.0, Quality Assurance and Reporting.
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- 7. 0 VERIFICATION OF PROTOTYPE PUMP OESIGN Verification of prototype pump shall be performed by analyses, qualifica-l tion test,e T--n'.; +...uce.
For verification it is necessary to evaluate e
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prototype pumps and previously qualified pumps to which changes have been made that make functional requalification necessary. The requirements for verifica-tion are presented below.
For clarity the seismic qualification requirements are explained separately from the functional pump requirements.
7.1 General The verification process is to assure functional qualification of the pump prototype and is performed by one or more acceptible methods as outlined below.
Each verification method used, and the results of the verification, shall be documented in a form that is readily retrievable.
The results of the verification shall be auditable against the verification requirements. The term " verification" as used throughout this Standard implies not only that an analysis, qualification test and experience is valid and correct, but also that the analysis, test and field experience is applicable to the prototype pump under consideration.
Where changes are made to a previously qualified pump, verification methods shall be applied to the changes in the same manner as for the original prototype, including evaluation of the effects of the changes on the overall pump.
Verification of the prototype pump may be performed by verification of all its component parts. Justification of this approach shall be provided by
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evaluating the effects of interaction of the parts. Where this approach is used the evaluation of interaction shall be included in the documentation.
7.1. 2 Procedures The methods of prototype pump verification are:
a.
analyses; b.
qualification test; l
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pwmp, seis mELDQQ 45 g4(mi maul u g a C^'*#_ 07 7. 4.uay be w;cd.
- 7. 2 Analyses The pump manufacturer shall determine the deformation Ifmits, which shall not be exceeded to maintain the operability of the pump.
The pump manufacturer shall provide the necessary allowable stress values and material properties for the n)ncode materials used and analyzed for parts which affect operability.
In addition, the pump manufacturer shall assure the operability of the pump during normal and abnormal conditions by complying with the requirements stated below.
i 7.2.1 Loadings and Loading Combinations The design specification shall identify all steady-state and cyclic loadinga mechanical, ths.' mal or hydraulic transients that may occur during the life of the plant and the number of the anticipated transients in each case, the external loads which may act on the pump and the combinations of l
these loads which may occur simultaneously. The pump manufacturer shall l
consider in the analysis all specified conditions under which the pump is expected to operate.
l 7.2.2 Rotor Dynamics and Natural Frecuencies Satisfactory performance of the assembled pump / driver unit shall be the responsibility of the pump manufacturer. Any additional data required for this purpose shall be furnished by the driver and/or gearbox manufacturer.
Vibration limits of the pump shaft, or bearing housing if the shaft is
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not accessible, are specified in paragraph 6.5.3.
Vibration of any part of 16
e b.
By supplying the purchaser with evidence that the proposed item has successfully passed through a comprehensive testing program. The testing program shall have included full-scale testing which meets or exceeds the specified design basis conditions. A detailed description of the tests, test equipment, and actual test results shall be submitted.
7.3.5 Failure During Pump Qualification Test If any part of the pump fails during a qualification test program, the pump supplier shall prepare a report of the details of the failure and submit it to the purchaser as part of the Data Package. The report shall describe the cause of the failure, circumstances of operation at the time of failure, corrective measures employed, and qualification by redesign and retest.
7.3.6 Oualification Report Description of the test program, test conditions and test results shall be included in the qualification report required by Section 11.
- 7. 4 Experience 7.4.1 Prototyoe '
A, prototype is the first of a type to qualify under this standard.
It i
I may be that it has been developed from a model or previous prototype which is similar in many ways, or actually identical to some features of the new machine. Where these are identical the previous field experience may be used '
as verification of the functional integrity of the' prototype.
f 7.4.2 Prototyoe Characteristics
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A prototype may qualify under this standard by experience related to the l
following characteristics. The experience must reflect an equal or more conservative set of qualifying values than will be required by the current specification.
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Case,Stjffness.
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- b.,/ Shaft Stress, Material and Critical Speed.
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Bearing #aterial,Mounyr'gandClearances.
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7.4.3 Verification l
- 7. 4. 2: 1 Acceotance Criteria.
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a.
At least one pump identical to the prototype operating through conditions equivalent to specified criteria, of:
b.
At least three identical pumps operating which do not vary by more than one item from Table 9.1.2 or:
c.
At least five identical pumps cperating which do not vary by more than three items from Table 9.1.2 artd:
d.
If pumps are vertically suspended, the undamped length below floor i.s at least as great as qualifying prototype and any differences in support surface rigidity is shown to have no significant'effect on vibration l
characteristics.
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7.4.3.2 Geometric similarity (scaling) is a prerequisite for utilization of other sized pumps.
In addition to meeting the requirements of 7.4.3.1, the prototype pump being qualified shall not be physically more than 15 percent larger or smaller than the previously qualified pump being used for compari-son; the diameters of the pump's volutes or impellers shall be compared.
Flow at peak efficiency of the prototype shall be within plus or minus 20 percent of that for the previously qualified pump.
7.4.3.3 If the above experience requirements cannot be met as outlined, a test and/or analysis of the prototype shall be conducted.
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c.
Pump hold down fasteners and bolts d.
Shaft and rotor assembly e.
Keys, pins, fasteners, welds and bearings f.
Pump support pads g.
Pump foundation anchor bolts.
8.4 Combination of Test and Analysis In some cases the successful operation of the pump when subjected to the most severe combination of applicable loads cannot be demonstrated by either testing alone or analysis alone.
In these cases a qualification program which consists of testing in part and analysis in part shall be developed to suit the particular pump. This qualification program shall demonstrate that the pump is capable of operating when subjected to all applicable loads.
8.5 Documentation i
The quality assurance and reporting requirements applicable to dynamic qualification of pumps are given in Section 11.0.
9.0 VERIFICATION OF PRODUCTION PUMPS Production pumps shall be verified for equivalence to a prototype pump that has already been qualified.
Demonstration of equivalency includes i
comparison to a qualified prototype pump by analysis, testing, and operating I
experience or a combination of these methods.
9.1 Verification Method a.
demonstration of equivalency to a qualified prototype; b.
evaluation and qualification by analyses, test, ewpecteme or a combination of methods of the differences between the prototype and production i
pumps; 29
4 9.4.2.2 It may be necessary to test some vertical pumps with portions omitted because of factory height limitations.
In this case, discharge head as measured will be different from rated head. Corrections for this head discrepancy shall be made by the manufacturer during the test and the correction noted in the test report. "JM (W % l*
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n 9.4.3 Test Fluid Unless otherwise stated in the Design Specifications, the test liquid shall be clean, cold water (see Hydraulic Institute Standard).
9.4.4 Required Pump Tests 9.4.4.1 - The following tests are required or optional. Optional tests shall be performed when required by the Design Specification.
Required Ootional A.
Hydrostatic Test X
9.
Hydraulic Performance Test X
C.
Mechanical Running Test X
0.
Net Positive Suction Head Test
- X E.
Natural frequency test for vertical turbine type pumps only X
9.4.4.2 Hydrostatic Test - All pressure boundary parts which are under the jurisdication of the ASME Code,Section III, shall be hydrostatically tested in accordance with the applicable Code requirements, unless the Design Specification imposes more stringent requirements.
9.4.4.2.1 Special Hydrostatic Test for Vertical Pumps - For vertical pumps, when hydrostatic tests are specified for component parts which are not part of the pressure boundary, the test pressure shall be 1.5 times the maximum differential pressure to which the parts are subjected.
Test may
"(Refer to Section 7.3.3.1 for description of test.)
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APPENDIX A RECOMMENDATIONS FOR THE DESIGN OF SAFETY RELATED PUMPS A.1 PIPING, VALVES AND FITTINGS All removable auxiliary piping, including supply and takeoff connections for the gland, seal leakoffs, vents, drains and oil system may terminate with a flange or pipe thread.
The minimum size for connections to the pump should be 3/4-inch Schedule 80 nominal pipe size, except for seal connections.
Smaller sizes are subject to approval by the owner or his agent.
A.2 PUMP ASSEMBLY TYPES Typical pump assemblies covered by this Standard are shown in Figures 1 through 10.
These figures are for classification only and are not intended to dictate details of construction or cover every acceptable design or arrangement.
Vertical Coupled Pump. Figure 2.
a.
Thrust Bearing.
The pump axial thrust load is taken by the driver thrust bearing.
Bearing loads imposed on the driver by the pump shall be specified by the pump manufacturer.
b.
Pump Radial Bearing.
j The bearing shall be lubricated by the fluid being pumped.
c.
Journal for Sleeve-Type Bearing.
5 The shaft my have a sleeve p d.
The journal and bearing shall form a non galling combination.
A-1 l